Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
va tham » van tham, va thanh, va thuat
sach ky » sac ky, sach y, sach ty
dang xa » dang xay, lang xa, dang ha
xuc van » duc van, luc van, vuc van
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
va cham » va chat

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky dang xa hoi. hieu ((va tham) or (va cham)) xuc van hanh vi ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xa hoi. hieu ((va tham) OR (va cham)) xuc van hanh vi ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xa hoi. hieu ((va tham) or (va cham)) xuc van hanh vi ((cua tre) or (su triet))*.